package org.itstack.demo.design.event;

import org.itstack.demo.design.ICouponDiscount;

import java.math.BigDecimal;
import java.util.Map;

public class MJCouponDiscount implements ICouponDiscount<Map<String, String>> {

    /**
     * 满减计算：
     *  1.判断满足x元后，否则不减
     *  2.最低支付金额1元
     */
    @Override
    public BigDecimal discountAmount(Map<String, String> couponInfo, BigDecimal skuPrice) {
        String x = couponInfo.get("x");
        String o = couponInfo.get("n");

        // 小于商品金额条件的，直接返回商品原价
        if (skuPrice.compareTo(new BigDecimal(x)) < 0) return skuPrice;
        BigDecimal discountAmount = skuPrice.subtract(new BigDecimal(o));
        if (discountAmount.compareTo(BigDecimal.ZERO) < 1) return BigDecimal.ONE;
        return discountAmount;
    }
}
